Vax 4000/300 and Ultrix - test-drb@ccmp.vtda.org

14 Apr 2002

On April 14, Sridhar the POWERful wrote:
...
    Especially since that machine isn't Qbus. 
It's main bus is that 4300+
 PELE stuff.  True and false. ;-)
 The machine has a QBus and therefore the CPU card has a QBus interface.
 So it is a QBus VAX by my definition.
 The CPU board is no QBus board like the KA630..KA660. It has a special
 backplane connector and the (passive) backplane distributes the signals
 from this connector to the QBus slots, the memory slots and DSSI drive
 bays. So this is no QBus VAX by your definition.  
 But that is not how I define it.  The system bus of this machine is not
 Qbus, so the machine is not a Qbus machine. 
  Why, because the memory isn't on the Qbus?  The MicroVAX-II's memory
isn't on the Qbus either.  The only other difference (in this context)
is the presence of a DSSI adapter on the CPU board that isn't
connected [logically] via the Qbus.  Many systems have several busses.
Which do you use to define the "bus" of the machine?

         -Dave

-- 
Dave McGuire              "Hush and eat your vegetables, young lady!"
St. Petersburg, FL                          - Mr. Bill

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